Specifically he smells like a guy who's kinda living on sand 24/7. And there's the aforementioned salt. So... beach scent. Whoops?

Stitch takes another loud slurp of hot chocolate, burrowing slightly farther into the chair.

'Stuck on an island' doesn't really explain why Hurley's sleeping in the sand rather than going indoors and taking advantage of the A/C or the fridge... or.. y'know, the bed.

The derisive expression might be belying some of this thought process.